linux-kernel - [PATCH -mm] PNP: Make pnpacpi

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Date:	Fri, 17 Aug 2007 15:30:28 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jaroslav Kysela <perex@...e.cz>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <len.brown@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: [PATCH -mm] PNP: Make pnpacpi_suspend handle errors

From: Rafael J. Wysocki <rjw@...k.pl>

pnpacpi_suspend() doesn't check the result returned by
acpi_pm_device_sleep_state() before passing it to acpi_bus_set_power(), which
may not be desirable.  Make it select the target power state of the device
using its second argument if acpi_pm_device_sleep_state() fails.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Looks-ok-to: Pavel Machek <pavel@....cz>
---
 drivers/pnp/pnpacpi/core.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

Index: linux-2.6.23-rc3/drivers/pnp/pnpacpi/core.c
===================================================================
--- linux-2.6.23-rc3.orig/drivers/pnp/pnpacpi/core.c	2007-08-15 14:56:58.000000000 +0200
+++ linux-2.6.23-rc3/drivers/pnp/pnpacpi/core.c	2007-08-15 15:08:36.000000000 +0200
@@ -130,11 +130,16 @@ static int pnpacpi_disable_resources(str
 #ifdef CONFIG_ACPI_SLEEP
 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 {
-	return acpi_bus_set_power((acpi_handle) dev->data,
-				  acpi_pm_device_sleep_state(&dev->dev,
-							     device_may_wakeup
-							     (&dev->dev),
-							     NULL));
+	int power_state;
+
+	power_state = acpi_pm_device_sleep_state(&dev->dev,
+						device_may_wakeup(&dev->dev),
+						NULL);
+	if (power_state < 0)
+		power_state = (state.event == PM_EVENT_ON) ?
+				ACPI_STATE_D0 : ACPI_STATE_D3;
+
+	return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 }
 
 static int pnpacpi_resume(struct pnp_dev *dev)
-
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